[Bug 1988440] [NEW] Regression in 22.04: segmentation fault when language is spanish

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Sergio Costas (rastersoft-gmail):

The discussion here describes the issue in full detail:
https://forum.snapcraft.io/t/segment-fault-with-snap-store/31547

The bug was caused by a double-free in libxmlb, triggered by some
specific data combination.

[Impact] This bug has been in the library since, at least, version
0.1.8, the one used in Bionic. Although the patch attached here fixes
the problem in the "snap-store" snap, the bug is still present in the
libraries distributed as .deb in Ubuntu, and also in the GNOME-42
extension snap. A patch has been sent both to the libxmlb repository
(which has been accepted and merged) and to the Debian SALSA repository.

[Test plan] To test this bug, just download the GIT repository
https://github.com/sergio-costas/test_libxmlb2 and follow the
instructions. If the bug is there, valgrind will show an access to an
already freed memory block and six CRITICAL errors will be shown by
GLib.

[Where problems could occur] If another developer adds code that uses
the 'xb_builder_xml_lang_prio_cb()' function and forgets to define a
destruction function for the passed 'nodes_to_destroy' ptr_array, there
would be a memory leak.

** Affects: snap-store-desktop
     Importance: Critical
     Assignee: Sergio Costas (rastersoft-gmail)
         Status: Fix Committed

** Affects: libxmlb (Ubuntu)
     Importance: Critical
     Assignee: Sergio Costas (rastersoft-gmail)
         Status: In Progress

** Affects: libxmlb (Ubuntu Bionic)
     Importance: Undecided
     Assignee: Sergio Costas (rastersoft-gmail)
         Status: In Progress

** Affects: libxmlb (Ubuntu Focal)
     Importance: Undecided
     Assignee: Sergio Costas (rastersoft-gmail)
         Status: In Progress

** Affects: libxmlb (Ubuntu Jammy)
     Importance: Undecided
     Assignee: Sergio Costas (rastersoft-gmail)
         Status: In Progress

** Affects: libxmlb (Ubuntu Kinetic)
     Importance: Critical
     Assignee: Sergio Costas (rastersoft-gmail)
         Status: In Progress

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Regression in 22.04: segmentation fault when language is spanish
https://bugs.launchpad.net/bugs/1988440
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